55561515666011 has 2 divisors, whose sum is σ = 55561515666012. Its totient is φ = 55561515666010.

The previous prime is 55561515666001. The next prime is 55561515666023. The reversal of 55561515666011 is 11066651516555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 55561515666011 - 2³⁴ = 55544335796827 is a prime.

It is not a weakly prime, because it can be changed into another prime (55561515666001) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27780757833005 + 27780757833006.

It is an arithmetic number, because the mean of its divisors is an integer number (27780757833006).

Almost surely, 2^{55561515666011} is an apocalyptic number.

55561515666011 is a deficient number, since it is larger than the sum of its proper divisors (1).

55561515666011 is an equidigital number, since it uses as much as digits as its factorization.

55561515666011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4050000, while the sum is 53.

The spelling of 55561515666011 in words is "fifty-five trillion, five hundred sixty-one billion, five hundred fifteen million, six hundred sixty-six thousand, eleven".